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You are probably suffering recurrent folliculitis
in the buttock area. Other possibility I would like to consider if you are very hairy and sit for prolonged time is Pilonidal Sinus
. Both of them require assessment by General Surgeon
. It will require a course of antibiotics like Augmentin
for 7 - 10 days., local ointment, hot seitz bath. If it turns out to be Pilonidal sinus/ fistula in ano it will require further surgical intervention. Any case you need to see a Surgeon.
Do get back if you have any doubts.